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 (to͞o′nĭ-kə, tyo͞o′-)
n. pl. tu·ni·cae (-kē′, -sē′)
An enclosing membrane or layer of tissue.

[Latin, tunic; see tunic.]


1. (Anatomy) anatomy tissue forming a layer or covering of an organ or part, such as any of the tissue layers of a blood vessel wall
2. (Botany) botany the outer layer or layers of cells of the meristem at a shoot tip, which produces the epidermis and cells beneath it. Compare corpus4
[C17: from Latin tunica tunic]


(ˈtu nɪk, ˈtyu-)

1. a coat worn as part of a military or other uniform.
2. a gownlike outer garment worn by the ancient Greeks and Romans.
a. a woman's straight, usu. sleeveless upper garment, loose or fitted, extending to the hips or below.
b. Also called tu′nic dress`. any of various dresses styled like this or incorporating this as one element.
4. tunicle.
5. a covering membrane, layer, or integument over an organ or part.
[1600–10; (< French tunique) < Latin tunica]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tunica - an enveloping or covering membrane or layer of body tissuetunica - an enveloping or covering membrane or layer of body tissue
tissue layer, membrane - a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
albuginea - whitish tunic
References in periodicals archive ?
The dystrophic calcified material also seen in between the tunica interna and tunica media.
The aim of this study is to describe the structural changes in tunica media that lead to arterial stiffness.
During foetal age 50-98days, the vessels maintained the same number and showed further differentiation of the tunics into tunica intima, tunica media and adventitia.
Conventionally, cells in the large arteries, whose wall are composed of three layers including tunica intima, tunica media and tunica adventitia, are mainly comprised of endothelial cells, smooth muscle cells (SMCs), fibroblasts (FBs), and macrophages.
Smooth muscle cells are primarily located in the arterial tunica media in a non-proliferative state during homeostasis.
The external elastic membrane is a layer of elastin that separates the tunica media from the tunica adventitia.
Eosinophilic coronary monoarteritis (ECM) is a rare event characterized by the presence of an inflammatory infiltrate, predominantly of eosinophils, in the tunica adventitia and tunica media of the coronary artery.
Histopathologically all coronary aneurysms involve destruction of the tunica media which is thinned, sometimes markedly, sometimes to the point of no longer being identifiable between the tunica intima and tunica adventitia.
The tunica media contained fragmented elastic layers separated by extracellular matrix (Figs 3G and H).
Histologically, a 'Normal' aorta was characterised as having a tunica intima that was relatively thin and loose, with regularly arranged smooth-muscle cells and elastin fibres in the tunica media, and a loosely organised tunica adventitia.
Histological review of the MCA revealed the presence of well-developed internal elastic lamina, tunica media and tunica adventitia.
A ocorrencia natural de metaplasia osteo-cartilaginosa, com formacao de medula ossea na tunica media da aorta em coelhos, ja havia sido relatada por SHELL & SAUNDERS (1989).